Lukas Ahrens, Yvonne J. Hofstetter, Barış Çelik, J. Butscher, F. Rominger, Jan Freudenberg, Y. Vaynzof, U. Bunz
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Dimeric Phenazinothiadiazole Acceptors in Bulk Heterojunction Solar Cells
Abstract Two covalently linked triisopropylsilyl-ethynylated phenazinothiadiazoles were prepared through condensation of a spirocyclic and a bicyclic tetraketone with a 5,6-diaminobenzothiadiazole. The spirobisindene- and the ethanoanthracene-based linkers render the electron acceptors amorphous in thin films. The optoelectronic properties of the non-conjugated dimers are indistinguishable from that of the crystalline monomer. Bulk heterojunction solar cells were prepared with power conversion efficiencies peaking at 1.6%. The choice of linker neither influenced optical and electrochemical properties nor device performance.
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